@Miaze so as it turns out I had a bad Ethernet cable. I had finished the ends on my cable myself, and one of them was apparently finished badly, when I changed the cable, it all worked out.

@OKeefe Hi guys, I'm literally having a similar problem. I have six X60 Deco's in my house all are connected via ethernet. 4 of them connect directly to the ISP router and the two new ones are...